Im so torn!! If its too long to read skip to the bottom. Working/going back to school with kids!!!

I've been with my fiance for over 2years now, and our relationship is amazing! But I had my mirena iud removed in December, because it was causing cysts on my ovaries, (no intentions of TTC). But a couple weeks after removal, he decides he wants a baby, (we both have a child by previous relationships) and my ex left me the day after I found out I was pregnant with my little girl, even though we were trying, so that scares me! I know he isnt my ex but still! Also, I found out last month I was accepted into a nursing program, which is like a dream come true for me! It's a 2year program, and it's already going to be hard to take on with a 3year old. Even though if we were to conceive I'd make it work.. But he also makes me feel horrible for not conceiving already, not meaning to, just every time my period comes he gets down hearted, and he'll buy me pregnancy test, and make me take them, and when they are negative he gets upset. And he'll say things like "are you off your period yet, I want to have a baby". I know he doesn't mean to make me feel bad, I've talked to him about it, but it still does. I can tell how much he wants this, but with going back to school and already having a 3year old, I'm not sure u can handle it.

I guess my big question is has any one else juggled 1child, a pregnancy then a new born and going to college or work, ect. And how did you cope?!?